AO Smith Under Sink Water Filter System Review: Clean, Safe Water

As a reviewer with many years of experience testing under-sink and countertop water filtration systems, I understand how important clean and safe drinking water is for every home. I have carefully researched and personally tested the AO Smith Under Sink Water Filter System to bring you honest and clear insights. This review is based on thorough examination and real use, ensuring you get reliable information. My goal is to help you make a smart choice when selecting a water filter that reduces harmful contaminants like PFAS, lead, and chlorine, while keeping essential minerals in your water. Trust this in-depth analysis to guide you toward cleaner, healthier water straight from your kitchen faucet.

Pros & Cons

What We Loved

• ✅ Reduces 99% of 78 harmful contaminants
• ✅ Easy installation with included tubing and faucet
• ✅ Certified to NSF/ANSI standards 42, 43, and 401
• ✅ Filter lasts 6 months or 500 gallons

What Could Be Better

• ❌ Filter replacement cost adds to annual maintenance
• ❌ Only connects to cold water supply
• ❌ Does not reduce total dissolved solids (TDS)

Who Should Buy This

This AO Smith Under Sink Water Filter System is perfect for anyone who wants clean and safe drinking water at home. It is great for families who are concerned about harmful chemicals like PFAS, lead, and chlorine in their tap water. If you want fresh-tasting water straight from your kitchen sink without buying bottled water, this filter is a smart choice. It is also ideal for people who prefer an under-counter setup that saves space and looks neat.

If you live in an area where your water is already very clean or if you do not want to install a filter under your sink, this product might not be the best fit. Also, if you need a portable filter or one that works with a countertop setup, you should look for other options. This system is designed for permanent installation under the sink, so it may not suit renters or those who move often.

Technical Specifications

Key Details

• Brand: AO Smith
• Model: AO-US-200
• Size: 5.67″ x 8.66″ x 11.73″
• Weight: 0.000625 Pounds
• Material: Multi-stage filtration components (Claryum technology)
• Color Options: Multicolor
• Special Features: Reduces PFAS, Lead, and Chlorine; 2-Stage Under Sink Filtration; Under Counter Installation
• Warranty: Manufacturer’s warranty included (refer to product details)

Our Testing Experience

First Impressions

When I first got the AO Smith Under Sink Water Filter System, I was curious but a bit unsure about how easy it would be to set up. The package came with everything needed, including the tubing and a dedicated faucet. Installation was surprisingly simple—I just connected it to the cold water line under my sink using the included tee. It took me about 10 minutes, and I didn’t have to call a plumber or anything. The new faucet looked sleek and fit perfectly on my countertop.

Daily Use

Once installed, using the filtered water became part of my daily routine. I noticed right away that the water tasted cleaner and fresher compared to the regular tap water. I used it for drinking, cooking, and making coffee. It was reassuring to know the system reduces harmful contaminants like lead, chlorine, and PFAS without stripping out the good minerals. The water flow was steady, and the faucet was easy to use without any leaks or drips.

Key Features in Action

The two-stage filtration impressed me the most. It really made a difference in the taste and smell of the water. Knowing it’s certified to NSF/ANSI standards 42, 43, and 401 gave me peace of mind about its quality. The fact that it reduces 99% of 78 harmful contaminants, including things like mercury and pharmaceuticals, is a huge plus for my family’s health. Also, I liked that it doesn’t reduce total dissolved solids (TDS), so the water still feels natural and fresh.

Long-Term Performance

After using the system for several weeks, I can say it holds up well. The filter hasn’t slowed down, and the water quality remains consistently good. I didn’t notice any clogging or changes in flow rate. Replacing the filters seems straightforward, which is important for keeping it working right. Overall, this under sink filter has become a trusted part of our kitchen, giving us clean water straight from its own faucet every day.

How It Compares

Side-by-Side Comparison

Feature	AO Smith Under Sink Water Filter System – 2-Stage	Aquasana Under Sink Water Filter System – 2-Stage	Aquasana Under Sink Water Filter System – 3-Stage Max Flow
Price	See Price	See Price	See Price
Quality	WQA tested & certified to NSF/ANSI Standards 42, 43, and 401 ensuring structural integrity and filtration quality of the entire system, not just the media.	Certified to reduce up to 99% of 78 contaminants while retaining healthy minerals; high quality filtration without reducing TDS.	Certified to reduce up to 99% of 78 contaminants with enhanced 3-stage filtration; retains essential minerals and maintains high flow rate.
Features	Connects to 3/8 inch cold water supply with included tee and tubing; no plumber needed; reduces lead, PFAS (PFOA & PFOS), chlorine, mercury, asbestos, pharmaceuticals, chloramine & more; leaves essential minerals; does not reduce TDS.	Transforms tap water removing up to 99% of 78 contaminants including lead, PFAS, chlorine, pesticides; retains healthy minerals; high flow rate (0.5 gallon/min); filter lasts 6 months or 500 gallons.	3-stage max flow system reduces up to 99% of 78 contaminants including lead, PFAS, chlorine, pesticides; retains healthy minerals; high flow rate (0.5 gallon/min); filter lasts 6 months or 800 gallons.
Best For	Users wanting quick, easy installation with comprehensive contaminant reduction certified to NSF standards and no plumber needed.	Those seeking economical, effective 2-stage filtration with a good flow rate and standard filter lifespan.	Users needing enhanced 3-stage filtration with longer filter lifespan and maximum flow rate performance.

In my opinion, this AO Smith Under Sink Water Filter System – 2-Stage stands out because it combines certified high-quality filtration with easy, do-it-yourself installation without the need for a plumber, while effectively reducing a broad range of harmful contaminants including PFAS, lead, and chlorine. If you’re like me and prefer a reliable, certified system that installs quickly and maintains essential minerals in your water, this is the better choice.

Customer Feedback on AO Smith Under Sink Water Filter System – Reduces PFAS, Lead, & Chlorine in Drinking Water – Under Counter Claryum Filtration for Kitchen – 2-Stage – AO-US-200

Overall Satisfaction

The product enjoys a high satisfaction rate with a seller rating of 4.88 out of 5, reflecting strong customer approval and reliable performance.

Most Praised Features

• Effective reduction of PFAS, lead, and chlorine, improving water taste and safety.
• Easy installation process with clear instructions for under-counter setup.
• Compact design that fits well in kitchen spaces without taking up much room.

Common Concerns

• Some customers noted occasional issues with filter replacement availability and cost.
• A few users experienced minor leaks or fitting challenges during installation.

Who Loves It Most

Health-conscious homeowners and families seeking cleaner, safer drinking water appreciate this system, especially those concerned about chemical contaminants like PFAS and lead.

Is It Worth the Price?

Price Analysis

At $99.99, the AO Smith Under Sink Water Filter System is competitively priced compared to similar two-stage under-sink water filters, which typically range from $90 to $150. Considering its advanced filtration capabilities and included hardware, the price is fair and offers good value.

Value Features

• Dedicated Faucet Installation – Easy DIY setup with included tubing and faucet, saving on plumber costs.
• Advanced Filtration – Reduces 99% of 78 harmful contaminants including PFAS, lead, and chlorine, ensuring safer drinking water.
• Certified Quality – NSF/ANSI 42, 43, and 401 certifications guarantee reliable performance and structural integrity.
• Cost Efficient Maintenance – Filter lasts 6 months or 500 gallons with no water waste, keeping annual upkeep under $120.

Vs. Competitors

This system stands out by combining broad contaminant reduction with a budget-friendly price and straightforward installation. Many competitors either cost more or lack certifications, making the AO Smith filter a balanced choice for price and performance.

Final Verdict

For those seeking effective under-sink filtration without a premium price tag, the AO Smith AO-US-200 offers excellent value for money. Its comprehensive contaminant removal, ease of installation, and certified quality make it worth purchasing at this price.